Oolong-san's comment.

This time round I was called on as a guest artist again! Woo-hoo!

Sakuya-san in the SakuRei pairing is has the image of a kayoidzuma compared to Reimu who just leisurely wanders to the Scarlet Devil Mansion(to mooch off food). Even so, I think that this idea is pretty cute. kayoidzuma is a wife who lives apart from the husband but goes to visit him frequently.